Insulating sleeve



FIG. 1 is a front perspective view of an insulating sleeve showing my new design.

FIG. 2 is a side view of the embodiment in FIG. 1;

FIG. 3 is a top view of the embodiment in FIG. 1;

FIG. 4 is a rear view of the embodiment in FIG. 1; and,

FIG. 5 is a bottom side view of the embodiment in FIG. 1. 

CLAIM The ornamental design for an insulating sleeve, as shown and described. 